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    Subject
    Physics

    Class

    ICSE Class 12

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    ISC Class 12 Physics Solved Question Paper 2011

    Multiple Choice QuestionsShort Answer Type

    11. In Fraunhofer’s single slit diffraction experiment, how does semi-angular with θ of the central bright fringe depned on slit width ‘a’ ?
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    12. State one use of a Polaroid.
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    13. A ray of light LM incident normally on the surface AC of an isosceles right angled prism ABC (where AB = BC) emerges along PQ, parallel to LM, shwon in Figure.


    What can you say about refractive index μ of the material of the prism?

    ∠A = angleC = 45°

    ∠ i = 45°

    For total internal reflection to take place at faces,

    sin space i space equals space 1 over n semicolon space w h e r e space n space i s space t h e space r e f r a c t i v e space i n d e x space o f space p r i s m space w. r. t o space a i r s i n space 45 greater than thin space 1 over straight n space semicolon straight n space greater than thin space fraction numerator 1 over denominator sin space 45 end fraction straight n space greater than thin space square root of 2 Refractive space index space of space prism space is space greater space than space square root of 2

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    14. State one condition for obtaining a sustained interference of light.
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    15. State any one postulate of Huygen’s wave theory.
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    16. How can an n type semiconductor be obtained from a pure crystal of germanium?
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    17. In the following nuclear reaction:

    straight C presubscript 6 presuperscript 11 space rightwards arrow space straight B presubscript 5 presuperscript 11 space plus space straight e presubscript 1 presuperscript 0 space plus space straight X
    What does X stand for?
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    18. In photoelectric effect, what is meant by the term’ threshold frequency’ ?
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    19. Find angular momentum of an electron when it is in the second Bohr orbit of hydrogen atom.
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    20. What is the symbol of a NOT gate?
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